<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>

        
        /* div {
            display: inline-block;
            font-size: 50px;
            transform: rotate(90deg)
        } */

        /* div {
            position: relative;
            width: 249px;
            height: 35px;
            border: 1px solid #000;
        }

        span {
            position: absolute;
            top: 8px;
            right: 15px;
            transform: rotate(90deg);
            transition: all 0.5s;
        }

        span:hover {
            transform: rotate(270deg);
        } */
    </style>
</head>

<body>
    <!-- <div>
        <span>></span>
    </div> -->
    <!-- <div>></div> -->


    <label>用户名: <input type="text"></label> <br>

    <label for="userName">用户名</label> <input type="text" id="userName">
</body>

</html>